Celestial bodies

1. How planets stay in their orbit around the sun
3. The number of phases in the lifecycle of a star
5. Rocky or metallic objects that orbit the sun
12. The name of phase one in the lifecycle of a star
14. The place where long period comets are located
15. Clouds of gas and dust in space often where stars are born
16. The shape of our galaxy the Milky Way
17. A dwarf planet
19. A piece of space rock that survived a journey through the Earth's atmosphere and has landed on Earth
21. Eigth and farthest known planet from the sun
23. Icy bodies that release gas and dust as they approach the sun

2. Another name for the rocky planets
4. Fifth planet from the sun and the largest in the solar system
6. Natural satellites that orbit planets
7. Sixth planet from the sun and the second largest in the solar system
8. Second planet from the sun. It is often called Earth's twin or sister planet
9. Seventh planet from the sun. It is a gaseous cyan coloured ice giant
10. Large collections of stars, gas and dust bound together by gravity, like the Milky way
11. Another name for the gas giant planets
13. Fourth planet from the sun. It is also known as the red planet
17. Planet with life
18. First planet from the sun and the smallest in the solar system
20. Hot star
22. No longer classed as a planet. It is a dwarf planet in the Kuiper belt